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2.0

Jun 17, 2019
06/19

by
A, García

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Las tic como mediación pedagógica

Topics: tic, aprendizaje, autonomía

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4.0

Jun 27, 2018
06/18

by
P. A. García-Sánchez

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We give an overview of the existing algorithms to compute nonunique factorization invariants in finitely generated monoids.

Topics: Combinatorics, Commutative Algebra, Mathematics

Source: http://arxiv.org/abs/1504.07424

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Sep 23, 2013
09/13

by
Miguel A. Garcia-Aspeitia

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In this paper, we investigate the possibility that a geometric model of dark energy that assume \textquotedblleft lower dimensions\textquotedblright, could generates a repulsive pressure which cause the current accelerated expansion of the Universe. We show how this geometrical model resemble as quintessence, cosmological constant and phantom energy during the cosmological evolution of the Universe choosing the corresponding matter scale factor as well as the possible consequences of this model...

Source: http://arxiv.org/abs/1109.5127v4

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Sep 23, 2013
09/13

by
D. A. Garcia-Hernandez

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Many complex organic molecules and inorganic solid-state compounds have been observed in the circumstellar shell of stars (both C-rich and O-rich) in the transition phase between Asymptotic Giant Branch (AGB) stars and Planetary Nebulae (PNe). This short (~100-10.000 years) phase of stellar evolution represents a wonderful laboratory for astrochemistry and provides severe constraints on any model of gas-phase and solid-state chemistry. One of the major challenges of present day astrophysics and...

Source: http://arxiv.org/abs/1111.1890v1

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Sep 19, 2013
09/13

by
M. A. Garcia-Bach

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The energy associated with bosonic and fermionic pairs of topological spin defects in doped antiferromagnetic quantum spin-1/2 square lattice is estimated within a resonating valence bond scenario, as described by a t-t'-J-like model Hamiltonian, plus a t-perpendicular, responsible of a three-dimensional screening of the electrostatic repulsion within the bosonic pairs. For parameters appropriate for monolayered high-T_c superconductors, both fermionic and bosonic pairs show x^2-y^2 symmetry....

Source: http://arxiv.org/abs/cond-mat/0507452v1

0
0.0

Jun 28, 2018
06/18

by
D. A. Garcia-Hernandez

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Extra-galactic planetary nebulae (PNe) permit the study of dust and molecules in metallicity environments other than the Galaxy. Their known distances lower the number of free parameters in the observations vs. models comparison, providing strong constraints on the gas-phase and solid-state astrochemistry models. Observations of PNe in the Galaxy and other Local Group galaxies such as the Magellanic Clouds (MC) provide evidence that metallicity affects the production of dust as well as the...

Topics: Astrophysics, Solar and Stellar Astrophysics

Source: http://arxiv.org/abs/1511.06165

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Sep 23, 2013
09/13

by
R. A. Garcia

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The NASA Kepler mission -in flight since March 2009- is producing an enormous number of high-quality continuous light curves. Now, and for the first time ever, we are able to do ensemble asteroseismology, i.e., to do an asteroseismic analysis with a statistically significant sub-sample of solar-like stars covering a wide range of stellar characteristics. In the present work, I highlight some of the most recent studies carried out using these data.

Source: http://arxiv.org/abs/1111.0994v1

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Dec 3, 2012
12/12

by
Miguel A. Garcia

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Topic: noise, experimental electronics, fiel recording, abstract landscape

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15

Dec 10, 2018
12/18

by
Miguel A. García

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One Perjury (Coccyx)

Topic: Abstract

0
0.0

Jun 28, 2018
06/18

by
Rafael A. Garcia

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As said by Sir A. Eddington in 1925: Our telescopes may probe farther and farther into the depths of space. At first sight it would seem that the deep interior of the sun and stars is less accessible to scientific investigation than any other region of the universe. What appliance can pierce through the outer layers of a star and test the conditions within? Eddington (1926). Nowadays, asteroseismology has proven its ability to pierce below stellar pho- tospheres and allow us to see inside the...

Topics: Astrophysics, Solar and Stellar Astrophysics

Source: http://arxiv.org/abs/1510.02651

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Jun 15, 2009
06/09

by
Miguel A. Garcia

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Miguel Angel Garcia (a.k.a. Xedh) Live at casa de los Jacintos, Madrid. Performing his grater drone sesion ever. Laptop and Mix-table 2009-30-05

Topics: HAMAIKETAKO, xedh, Miguel a. garcia, drone, experimental, live casa de los jacintos, madrid

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Sep 22, 2013
09/13

by
D. A. Garcia-Hernandez

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The Magellanic Clouds (MCs) offer a unique opportunity to study the stellar evolution and nucleosynthesis of massive Asymptotic Giant Branch (AGB) stars in low metallicity environments where distances are known. Rubidium is a key element to distinguish between high mass AGB stars and low mass AGBs or other type of astronomical objects such as massive red supergiant stars. Theoretically, high mass AGBs are predicted to produce a lot of Rb. We present the discovery of massive Rb-rich AGB stars in...

Source: http://arxiv.org/abs/1101.3515v1

0
0.0

Jun 29, 2018
06/18

by
Rafael A. Garcia

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Sun-as-a star observations put our star as a reference for stellar observations. Here, I review the activities in which the SPACEINN global seismology team (Working Package WP4.1) has worked during the past 3 years. In particular, we will explain the new deliverables available on the SPACEINN seismic+ portal. Moreover, special attention will be given to surface dynamics (rotation and magnetic fields). After characterizing the rotation and the magnetic properties of around 300 solar-like stars...

Topics: Astrophysics, Solar and Stellar Astrophysics

Source: http://arxiv.org/abs/1611.03706

2
2.0

Jun 27, 2018
06/18

by
M. Á. García-Ariza

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A manifold $M$ is said to be radiant if it is endowed with a distinguished atlas whose coordinate changes are locally linear transformations. Such manifolds are thereby furnished with a flat connection $\bar\nabla$ and a radiant vector field $\rho$ whose covariant derivative is the identity mapping. A degenerate Hessian metric on $M$ is a symmetric, positive semi-definite tensor field g of type (0, 2) that can locally be written as the covariant Hessian of a function, called local potential,...

Topics: Mathematics, Mathematical Physics

Source: http://arxiv.org/abs/1503.00689

0
0.0

Jun 29, 2018
06/18

by
Ronaldo A. Garcia

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The locus of centers of inscribed circles in triangles, the 3-periodic orbits of an elliptic billiard, is also an ellipse. In this work we obtain the canonical equation of this ellipse, complementing the previous results obtained by O. Romaskevich.

Topics: Metric Geometry, Dynamical Systems, Mathematics

Source: http://arxiv.org/abs/1607.00179

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0.0

Jun 30, 2018
06/18

by
A. García Muñoz

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A significant body of work on simulating the remote appearance of Earth-like exoplanets has been done over the last decade. The research is driven by the prospect of characterizing habitable planets beyond the Solar System in the near future. In this work, I present a method to produce the disk-integrated signature of planets that are described in their three-dimensional complexity, i.e. with both horizontal and vertical variations in the optical properties of their envelopes. The approach is...

Topics: Earth and Planetary Astrophysics, Astrophysics

Source: http://arxiv.org/abs/1409.8573

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Sep 22, 2013
09/13

by
R. A. Garcia

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The quest of the knowledge of the structure and dynamics of the solar interior has been possible thanks to the study of the resonant acoustic (p) modes that are trapped in the solar interior. Since the solar rotation lifts the azimuthal degeneracy of the resonant modes, their eigenfrequencies are split into their m-components; where l is the angular degree, n the radial order, and, m the azimuthal order. This separation --usually called rotational splitting (or just splitting)-- depends on the...

Source: http://arxiv.org/abs/0805.3293v1

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Sep 22, 2013
09/13

by
R. A. Garcia

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Today, asteroseismology is entering in its golden age thanks to the observations provided by the CoRoT and Kepler space missions. In particular, we will make significant progresses in the understanding of the structure and evolution of solar-like oscillating stars. These stars have acoustic modes stochastically excited by the near-surface convection. Thanks to the observations already provided by these two missions, we have detected several hundred of stars showing solar-like oscillations in...

Source: http://arxiv.org/abs/1101.0236v1

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216

Feb 4, 2012
02/12

by
miguel a. garcía

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recorded live in amma house, washington dc date 18-09-11 drawing by raul dominguez special thanks to chethan kenkeremath www.xedh.org New release by Miguel A. García, this time on a different way. Bulbul Tarang is a solo improvisation, spontaneous and quite carefree. It is shy at the beginning, but inmediately takes an determined, insistent and hipnotic way.

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0.0

Jun 28, 2018
06/18

by
Miguel A. Garcia-Aspeitia

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We consider here a robust study of stellar dynamics for White Dwarf Stars with polytropic matter in the weak field approximation using the Lane-Emden equation from the brane-world scenario. We also derive an analytical solution to the nonlocal energy density and show the behavior and sensitivity of these stars to the presence of extra dimensions. Similarly, we analyze its stability and compactness, in order to show whether it is possible to be close to the conventional wisdom of white dwarfs...

Topic: General Relativity and Quantum Cosmology

Source: http://arxiv.org/abs/1510.06814

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Jul 29, 2019
07/19

by
Luís A. García Moreno

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Historia de España Visigoda.

Topics: historia de España, visigodos

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Sep 22, 2013
09/13

by
R. A. Garcia

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During this conference, latest results on helioseismology (both local and global) as well as in asteroseismology have been reviewed, the hottest questions discussed and the future prospects of our field fully debated. A conference so rich in the variety of topics addressed is impossible to be deeply reviewed in a paper. Therefore, I present here my particular view of the field as it is today, concentrating on the solar-like stars and global helioseismology. The link I found to do so is the...

Source: http://arxiv.org/abs/1210.4691v1

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501

Feb 14, 2006
02/06

by
Eric A. Garcia

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A mad scientist creates a lover that quickly turns on him. Premiered at the Good, The Bad and The Indie in El Paso Texas, September 2005

Topics: science fiction, chicano cinema, arthouse, film festival

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13

Dec 10, 2018
12/18

by
Miguel A. García

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One Perjury (For Murayama)

Topic: Abstract

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Jul 20, 2013
07/13

by
M. A. Garcia-Bach

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For w-legged antiferromagnetic spin-1/2 Heisenberg ladders, a long-range spin-pairing order can be identified which enables the separation of the space spanned by finite-range (covalent) valence-bond configurations into w+1 subspaces. Since every subspace has an equivalent counter subspace connected by translational symmetry, twofold degeneracy, breaking traslational symmetry is found except for the subspace where the ground state of w=even belongs to. In terms of energy ordering,...

Source: http://arxiv.org/abs/cond-mat/9910455v1

0
0.0

Jun 30, 2018
06/18

by
Alberto A. Garcia Diaz

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Under the hydrodynamic equilibrium Buchdahl's conditions on the behavior of the density and the pressure, for regular fluid static circularly symmetric star in (2 + 1) dimensions in the presence of a cosmological constant, is established that there are no bounds from below on the pressure and also on the mass, except for their positiveness. The metric for a constant density distribution is derived and its matching with the external static solution with a negative cosmological constant is...

Topic: General Relativity and Quantum Cosmology

Source: http://arxiv.org/abs/1412.5620

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Sep 22, 2013
09/13

by
C. A. Garcia Trillos

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We propose an algorithm for approximating the solution of a strongly oscillating SDE, i.e. a system in which some ergodic state variables evolve quickly with respect to the other variables. The algorithm profits from homogenization results and consists of an Euler scheme for the slow scale variables coupled with a decreasing step estimator for the ergodic averages of the quick variables. We prove the strong convergence of the algorithm as well as a C.L.T. like limit result for the normalized...

Source: http://arxiv.org/abs/1210.2087v2

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Sep 22, 2013
09/13

by
C. A. Garcia Canal

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Summary of the Latin American Workshop on Fundamental Interactions held at the Physics Department of the Universidad de Buenos Aires from 26 to 30 July 2004.

Source: http://arxiv.org/abs/hep-ph/0409093v1

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Feb 3, 2014
02/14

by
Oscar A. García Solana

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Algunas de las biografías sobre Eligio Ancona fueron escritas por sus detractores, sin aportar suficientes pruebas históricas. En este libro, a partir de un análisis de antiguas y nuevas fuentes, se aporta otra visión sobre quién fue y cuándo nació don Eligio María Ancona Castillo, gobernador de Yucatán en el S. XIX.

Topics: Eligio Ancona, Historia de Yucatán

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438

Nov 11, 2012
11/12

by
miguel a. garcia

audio

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miguel a. garcia . tentacle composed by miguel a. garcia drawing by raul dominguez www.xedh.org

Topics: chirria sello11, miguel a. garcia. tentacle. sound. raul dominguez. drawing.

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Sep 22, 2013
09/13

by
S. Hekker; R. A. Garcia

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In this review we will discuss the current standing and open questions of seismology in active stars. With the longer photometric timeseries data that are --and will become-- available from space-missions such as Kepler we foresee significant progress in our understanding of stellar internal structures and processes --including interactions between them-- taking place in active stars in the next few years.

Source: http://arxiv.org/abs/1210.6322v1

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Sep 23, 2013
09/13

by
A. Garcia; G. Sanchez-Colon

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Bounds and presence of manifest right handed currents in neutron beta decay are reviewed. Assuming the unitarity of the Cabibbo-Kobayashi-Maskawa matrix, current experimental situation imposes very stringent limits on the mixing angle, $-0.00077

Source: http://arxiv.org/abs/1006.5417v1

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Sep 22, 2013
09/13

by
A. Garcia Cantu; M. Ausloos

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Social impacts and degrees of organization inherent to opinion formation for interacting agents on networks present interesting questions of general interest from physics to sociology. We present a quantitative analysis of a case implying an evolving small size network, i.e. that inherent to the ongoing debate between modern creationists (most are Intelligent Design (ID) proponents (IDP)) and Darwin's theory of Evolution Defenders (DED)). This study is carried out by analyzing the structural...

Source: http://arxiv.org/abs/0805.2912v1

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Sep 17, 2013
09/13

by
R. A. García; J. Ballot

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It is usual in helioseismology to remove unwanted instrumental low-frequency trends by applying high-pass filters to the time series. However, the choice of the filter is very important because it can keep the periodic signals throughout the spectrum. At the same time, these filters should not introduce any spurious effects on the remaining signal, which would modify the periodic signatures in the Fourier domain. One of the most used filters is the so-called backwards difference filter that can...

Source: http://arxiv.org/abs/0711.1050v1

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0.0

Jun 29, 2018
06/18

by
Á. García-Pérez; P. Nogueira

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In the lambda calculus a term is solvable iff it is operationally relevant. Solvable terms are a superset of the terms that convert to a final result called normal form. Unsolvable terms are operationally irrelevant and can be equated without loss of consistency. There is a definition of solvability for the lambda-value calculus, called v-solvability, but it is not synonymous with operational relevance, some lambda-value normal forms are unsolvable, and unsolvables cannot be consistently...

Topics: Logic in Computer Science, Computing Research Repository

Source: http://arxiv.org/abs/1604.08383

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Sep 18, 2013
09/13

by
Javier Chavarriga; I. A. García

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The Einstein field equations for several cosmological models reduce to polynomial systems of ordinary differential equations. In this paper we shall concentrate our attention to the spatially homogeneous diagonal G_2 cosmologies. By using Darboux's theory in order to study ordinary differential equations in the complex projective plane CP^2 we solve the Bianchi V models totally. Moreover, we carry out a study of Bianchi VI models and first integrals are given in particular cases.

Source: http://arxiv.org/abs/gr-qc/0101127v1

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Sep 23, 2013
09/13

by
Isaac A. García; Maite Grau

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The relation between limit cycles of planar differential systems and the inverse integrating factor was first shown in an article of Giacomini, Llibre and Viano appeared in 1996. From that moment on, many research articles are devoted to the study of the properties of the inverse integrating factor and its relation with limit cycles and their bifurcations. This paper is a summary of all the results about this topic. We include a list of references together with the corresponding related results...

Source: http://arxiv.org/abs/0903.0941v1

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Sep 22, 2013
09/13

by
Alberto A. Garcia; Cuauhtemoc Campuzano

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A subclassification of stationary spacetimes, endowed with one timelike and one spacelike Killing vectors, i.e., Petrov $G{_2}I$ on $T_2$ spaces, is proposed. Special attention deserves the Collison's theorem [1] and the branch of metrics circularly cyclicly (axially) symmetric possessing additionally the conformal flatness property reported by Garcia and Campuzano [2].

Source: http://arxiv.org/abs/gr-qc/0310054v1

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Sep 23, 2013
09/13

by
A. Jimenez; R. A. Garcia

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Gravity modes in the Sun have been long searched during the past decades. Using their asymptotic properties Garcia et al. (2007) found the signature of the dipole g modes analyzing an spectral window between 25 and 140 muHz of velocity power spectrum obtained from the GOLF/SoHO instrument. Using this result it has been possible to check some properties of the structure of the solar interior (Garcia, Mathur & Ballot 2008) as well as some indications on the dynamics of the core. However, the...

Source: http://arxiv.org/abs/0810.1706v1

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Sep 22, 2013
09/13

by
Heddy Boubaker, Miguel A. Garcia

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H.A.K. Lo-Fi Record n.243 AATXE - "Catastrophe Ultraviolette" 1. The String 2. Far The Quasar 3. Derrière 4. Le Bas Miguel A. Garcia (aka Xedh) : électronique http://www.xedh.org/ Heddy Boubaker : synthé modulaire analogique http://www.boubaker.net/ Improvisé et composé par Heddy Boubaker & Miguel A. Garcia en 2012 Mixé et masterisé en juillet/aout 2013 par Miguel A. Garcia Cover art par Nick Hoffman http://tomblegions.tumblr.com H.A.K. LO-FI RECORD

Topics: H.A.K. Lo-Fi Record, improvisation, electronics, analog, synth, Heddy Boubaker, Miguel A. Garcia,...

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0.0

Jun 30, 2018
06/18

by
Mauricio Cataldo; Alberto A. García

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In this paper we discuss the radiation equation of state $p=\rho/2$ in (2+1)-dimensions. In (3+1)-dimensions the equation of state $p=\rho/3$ may be used to describe either actual electromagnetic radiation (photons) as well as a gas of massless particles in a thermodynamic equilibrium (for example neutrinos). In this work it is shown that in the framework of (2+1)-dimensional Maxwell electrodynamics the radiation law $p=\rho/2$ takes place only for plane waves, i.e. for $E = B$. Instead of the...

Topics: High Energy Physics - Theory, Mathematics, Mathematical Physics, General Relativity and Quantum...

Source: http://arxiv.org/abs/1405.3878

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Sep 23, 2013
09/13

by
D. Salabert; R. A. Garcia

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In the case of spatially-revolved helioseismic data (such as MDI, GONG, HMI), the usual mode-fitting analysis consists of fitting the 2l+1 individual m-spectra of a given multiplet (n, l) either individually or simultaneously. Such fitting methods fail to obtain reliable estimates of the mode parameters (frequency, splitting, ...) when the signal-to-noise ratio (SNR) is low, which makes those methods not suitable when one wants to look at the low-amplitude, long-lived solar p modes in the...

Source: http://arxiv.org/abs/0810.1696v2

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Sep 20, 2013
09/13

by
A. Garcia; R. F. Lax

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Let $X$ denote an integral, projective Gorenstein curve over an algebraically closed field $k$. In the case when $k$ is of characteristic zero, C. Widland and the second author have defined Weierstrass points of a line bundle on $X$. In the first section, this definition is extended to linear systems in arbitrary characteristic. This definition may be viewed as a generalization of the definitions of Laksov and St\"ohr-Voloch to the Gorenstein case. In the second section, an example is...

Source: http://arxiv.org/abs/alg-geom/9208003v1

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Sep 23, 2013
09/13

by
A. Garcia; G. Sanchez-Colon

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We discuss the effect of the recent change of $V_{\rm us}$ by three standard deviations on the standard model predictions for neutron beta decay observables. We also discuss the effect the experimental error bars of $V_{\rm us}$ have on such predictions. Refined precision tests of the standard model will be made by a combined effort to improve measurements in neutron beta decay and in strangeness-changing decays. By itself the former will yield very precise measurements of $V_{\rm ud}$ and make...

Source: http://arxiv.org/abs/1006.5421v1

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Sep 22, 2013
09/13

by
Alberto A. Garcia; Cuauhtemoc Campuzano

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It is shown that within conformally flat stationary axisymmetric spacetimes, besides of the static family, there exists a new class of metrics, which is always stationary and axisymmetric. All these spacetimes, the static and the stationary ones, are endowed with an arbitrary function depending on the two non--Killingian coordinates. The explicit form of this function can be determined once the coupled matter, i.e., the energy--momentum tensor is given. One might hope possible extensions of...

Source: http://arxiv.org/abs/gr-qc/0205080v1

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May 17, 2012
05/12

by
Miguel A. García & Daniel Simon

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We don't need to think back to the London riots of August 2011 to find ourselves in a Ballardian context. Figures like the Spanish employment minister Fátima Báñez, the president of the Community of Madrid, Esperanza Aguirre or the magnificent Angela Merkel would have been characters that border on the implausible, and could have even been included in Ballard's dystopian visions. Thanks to the aggravation and extension of penal consequences in marches, the hardening of the Spanish penal code...

Topics: experimental, electronic music, electroacoustic, noise, industrial ambient

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Sep 22, 2013
09/13

by
A. Jimenez; R. A. Garcia

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Gravity modes in the Sun have been the object of a long and difficult search in recent decades. Thanks to the data accumulated with the last generation of instruments (BiSON, GONG and three helioseismic instruments aboard SoHO), scientists have been able to find signatures of their presence. However, the individual detection of such modes remains evasive. In this article, we study the signal at 220.7 microHz which is a peak that is present in most of the helioseismic data of the last 10 years....

Source: http://arxiv.org/abs/0908.0562v1

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Jul 20, 2013
07/13

by
F. Fantino; G. A. Garcia

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Let k be an algebraically closed field of characteristic 0 and let D_m be the dihedral group of order 2m with m= 4t, with t bigger than 2. We classify all finite-dimensional Nichols algebras over D_m and all finite-dimensional pointed Hopf algebras whose group of group-likes is D_m, by means of the lifting method. Our main result gives an infinite family of non-abelian groups where the classification of finite-dimensional pointed Hopf algebras is completed. Moreover, it provides for each...

Source: http://arxiv.org/abs/1007.0227v1

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3.0

Apr 21, 2019
04/19

by
José A. García, NGC 3660.

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Relato fantasía.

Topics: Navegando las cuerdas del acordeón, José A. García, NGC 3660, Relato fantasía, Fantasía,...

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Sep 21, 2013
09/13

by
G. Sanchez-Colon; A. Garcia

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Based on possible albeit tiny, admixtures of mirror matter in ordinary mesons we study the K_L \to \gamma\gamma transition. We find that this process can be described with a small SU(3) symmetry breaking of only 3%. We also determine the eta-eta' mixing angle and the pseudoscalar decay constants. The results for these parameters are consistent with some obtained in the literature. They favor two recent determinations; one based on two analytical constraints, and another one based on...

Source: http://arxiv.org/abs/hep-ph/0402199v1